Xcode 12 is slow when launching apps (even sample projects)

Developer Tools & Services Xcode Xcode WWDC20 Community Xcode Sanitizers and Runtime Issues

Created Jun ’20

Replies 34

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Participants 32

Running a project from Xcode 12 seems to be very slow during launch. Even the example projects from Apple.

Basically it feels as if the app is stuck on the launch screen?

However, if I unplug from my Mac and just launch via tapping on the App icon, it's super fast.

Anyone is having the same issue?

Answered by tundaware in 616750022

This isn't Xcode 12 specific.

Deleting the contents of ~/Library/Developer/Xcode/iOS DeviceSupport seems to be the fix (worked for me just now):
https://developer.apple.com/forums/thread/123068?answerId=420683022#420683022

Boost

peterboro OP

Oct ’20

I've been having the same issue since updating to Xcode12 and Xcode12.0.1 didn't fix it. It takes more than a minute from build successful to the app finally completing the launch because it's always stuck on this white screen.

waynehend OP

Oct ’20

Still a problem. Xcode Version 12.0 (12A7209)

Per advice here, I deleted the iOS 14 folder inside ~/Library/Developer/Xcode/iOS DeviceSupport.
(My iPhone is now on 14.0.1, so I left the 13.7 folder alone.)

It took a long time for Xcode to "copy cache files" from the iPhone but once that finally got done, normal build-and-run behavior is back. Nice and snappy.

BadinhHanoi OP

Oct ’20

for me, https://stackoverflow.com/questions/63929122/slow-app-launch-time-after-updating-to-ios-14-and-xcode-12

In the XCode menu, Go to Product > Scheme > Edit Scheme
Open the Info tab
Uncheck the Debug executables checkbox

has given.

acliyanarachchi OP

Nov ’20

This worked for xcode - 12.2 beta and IOS 14.2

Untick "Debug executable" from below paths worked for me.

Product -> Scheme -> Edit scheme -> Select Run (left column) -> untick "Debug executable"
Product -> Scheme -> Edit scheme -> Select Test (left column) -> untick "Debug executable"

Then close and run again.

Shastr OP

Dec ’20

its also could be instruments cache problems

fysteven OP

Dec ’20

Still an issue.

aureliogiovanni OP

Dec ’20

In my case removing all exceptions break point works fine

z3wind OP

Dec ’20

Xcode 12.3 causes this problem for me. Unpairing devices does not resolve the problem.

davicedraz OP

Jan ’21

Following exactly these instructions worked for me:

1) Unpair your phone from xcode
Launch xcode with your phone not plugged in
Plug your phone in
Under devices in xcode, unpair your phone
2) stop xcode
3) run these
rm -rf ~/Library/Developer/Xcode/iOS\ DeviceSupport
rm -rf ~/Library/Developer/Xcode/iOS\ Device\ Logs
rm -rf ~/Library/Developer/Xcode/DerivedData
4) start xcode
5) plug phone in

Gerald_Oluoch OP

Jan ’21

None of the solutions seems to be working, might be wise to wait for an update from Apple.

_david_robitaille_ OP

Feb ’21

If any of the solutions provided by other answers seem to be working, you can always try restarting your devices, it might help... Restarting your device will reboot your software and might get the speed of Xcode back to normal...

panosdrak OP

Feb ’21

Deleting the contents of iOS Device support folder did not work for me, although it freed almost 10GB+ of precious storage.

What did work for me, is unticking the "debug executable" option in Scheme settings. I greatly thank the person who instructed to do so, he saved me a lot of time.

julienheinen OP

Feb ’21

j'ai le même problème

MarkBok OP

Apr ’21

Go to Window/Devices and Simulators/uncheck Connect Via Network

vivek2698 OP

Apr ’21

Hi i have found there is a Malware in xcode projects that is XCSSET that causing many issue to mac and xcode project you can see a question for this issue solution check this : https://developer.apple.com/forums/thread/651012